A new regime for high rate growth of nanocrystalline diamond films using high power and CH4/H2/N2/O2 plasma |
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Authors: | CJ Tang I AbeAJS Fernandes MA NetoLP Gu S PereiraH Ye XF JiangJL Pinto |
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Affiliation: | a Department of Physics, Jiangsu Key Laboratory for Advanced Functional Materials, Changshu Institute of Technology, Changshu 215500, PR Chinab Department of Physics, I3N (Institute for Nanostructures, Nanomodelling and Nanofabrication), University of Aveiro, 3810-193 Aveiro, Portugalc CICECO, University of Aveiro, 3810-193 Aveiro, Portugald School of Engineering and Applied Science, Aston University, Aston Triangle, Birmingham, B4 7ET, UK |
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Abstract: | In this work, we report high growth rate of nanocrystalline diamond (NCD) films on silicon wafers of 2 inches in diameter using a new growth regime, which employs high power and CH4/H2/N2/O2 plasma using a 5 kW MPCVD system. This is distinct from the commonly used hydrogen-poor Ar/CH4 chemistries for NCD growth. Upon rising microwave power from 2000 W to 3200 W, the growth rate of the NCD films increases from 0.3 to 3.4 μm/h, namely one order of magnitude enhancement on the growth rate was achieved at high microwave power. The morphology, grain size, microstructure, orientation or texture, and crystalline quality of the NCD samples were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray diffraction, and micro-Raman spectroscopy. The combined effect of nitrogen addition, microwave power, and temperature on NCD growth is discussed from the point view of gas phase chemistry and surface reactions. |
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Keywords: | Nanocrystalline diamond (NCD) films High growth rate CH4/H2/N2/O2 plasma Microwave power High-power MPCVD |
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